Other
Scientific paper
Sep 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989rmxaa..18...11l&link_type=abstract
(Universidad Nacional Autonoma de Mexico and CONACYT, Conferencia Mexicana-Texana de Astrofisica, 2nd, Mexico City, MX, Feb. 22-
Other
Gravitational Collapse, Interstellar Gas, Molecular Clouds, Star Formation, Stellar Magnetic Fields, Ammonia, Molecular Diffusion, Stellar Cores, Stellar Gravitation, Turbulence Effects
Scientific paper
The importance of magnetic fields for the support of molecular clouds against self-gravity, and the process of bimodal star formation are reviewed. For the case of subcritical clouds that evolve through the process of ambipolar diffusion forming small dense cores, the two regimes for the evolution of the cores are discussed according to their mass. For a mass greater than an umbral mass, the process of ambipolar diffusion produces a centrally condensed core, that ultimately collapses, from inside out, to form a star. On the other side, a subumbral region evolves toward a stable final configuration where the mean magnetic field asymptotically become uniform and straight with thermal and turbulent pressure providing support against gravity. This region will not be either dense enough or big enough to excite measurable ammonia emission. Only if turbulence decays will these type of regions be able to form stars.
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